[DUCKIE]

After watching/helping catch many robots that had started rolling off their carts while going over the wire-protector at the field entrance, I would recommend that the cart supports the bot by it's frame instead of resting on it's wheels, or use some angle-iron around the cart edges to prevent loosing your bot off the top of the cart.

Also, never forget about the doorways, we had a robot cart one year that was wider than the average doorway... but not for long. Picking it up at every doorway got tiring REALLY quickly.